Slot machine and playing method thereof

ABSTRACT

A slot machine according to the present invention comprises: a display to which a plurality of symbols are arranged; a selection switch for selecting a symbol that is to be a particular symbol out of the plurality of symbols, and a controller which determines the symbol corresponding to an input from the selection switch as the particular symbol, determines a payout ranking of the particular symbol at random, and allots a prize based on the payout ranking, in an event that a predetermined number or more of at least one particular symbol is arranged to the display as a result of rearrangement of the plurality of symbols arranged to the display.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority of U.S. Provisional Application No.60/842,021 filed on Sep. 5, 2006. The contents of this application areincorporated herein by reference in their entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a slot machine and a playing methodthereof.

2. Discussion of the Background

In a conventional slot machine, if a player inserts gaming media such ascoins or bills into an insertion slot and pushes a spin button, then aplurality of symbols are displayed in a scrolling manner on a displayprovided on the front surface of a casing and, thereafter, therespective symbols are automatically stopped.

Among slot machines of this kind, there are slot machines designed withthe concept of a winning line, which pay out a predetermined number ofgame media in an event that the combination of symbols rearranged alonga winning line is a predetermined winning combination as disclosed in,for example, U.S. Pat. No. 6,093,102.

Further, among slot machines as described above, there are slot machineswhich pay out a predetermined number of game media, in an event that thecombination of symbols rearranged along a winning line is apredetermined winning combination, and also pay out a predeterminednumber of game media according to the number of symbols called scattersymbols arranged on a display, regardless of the winning line, asdisclosed in, for example, U.S. Pat. No. 6,604,999 and US2002-0065124-A1.

The present invention provides a slot machine and a playing methodthereof which have entertainment characteristics which have not beenallotted by the aforementioned conventional art.

The contents of U.S. Pat. Nos. 6,093,102 and 6,604,999 and US2002-0065124-A1 are incorporated herein by reference in their entirety.

SUMMARY OF THE INVENTION

A slot machine according to the first aspect of the present inventionprovides a slot machine having the following configuration.

That is, a slot machine according to the first aspect of the presentinvention comprises: a display to which a plurality of symbols arearranged; a selection switch for selecting a symbol that is to be aparticular symbol, out of the plurality of symbols; and a controller. Inthe above-mentioned slot machine, the controller determines the symbolcorresponding to an input from the selection switch as the particularsymbol, determines a payout ranking of the particular symbol at random,and allots a prize based on the payout ranking, in an event that apredetermined number or more of at least one particular symbol isarranged to the display as a result of rearrangement of the plurality ofsymbols arranged to the display.

A slot machine according to the second aspect of the present inventionprovides a slot machine having the following configuration.

That is, a slot machine according to the second aspect of the presentinvention comprises: a display to which a plurality of symbols arearranged; a selection switch for selecting a symbol that is to be aparticular symbol, out of the plurality of symbols; and a controller. Inthe above-mentioned slot machine, the controller counts the number ofgames, receives the input from the selection switch during apredetermined time period provided on condition that the number of gameshas reached a predetermined number, determines determining the symbolcorresponding to the input from the selection switch as the particularsymbol upon receipt of the input from the selection switch during thepredetermined time period, determines at random the particular symbolout of the plurality of symbols upon no receipt of the input from theselection switch during the predetermined time period, determines apayout ranking of the particular symbol at random, and allots a prizebased on the payout ranking, in an event that a predetermined number ormore of at least one particular symbol is arranged to the display as aresult of rearrangement of the plurality of symbols arranged to thedisplay.

A slot machine according to the third aspect of the present inventionprovides a slot machine having the following configuration.

That is, a slot machine according to the third aspect of the presentinvention comprises: a display to which a plurality of symbols arearranged; a selection switch for selecting a symbol that is to be aparticular symbol out of the plurality of symbols; and a controller. Inthe above-mentioned slot machine, the controller counts the number ofgames, changes the number of symbols to be selected as the particularsymbol every time the number of games reaches a predetermined number,receives an input from the selection switch during a predetermined timeperiod provided on condition that the number of games has reached apredetermined number, determines the symbol corresponding to the inputfrom the selection switch as the particular symbol, upon receipt of theinput from the selection switch during the predetermined time period,determines at random the particular symbol out of the plurality ofsymbols, upon no receipt of the input from the selection switch duringthe predetermined time period, determines a payout ranking of theparticular symbol at random, and allots a prize based on the payoutranking, in an event that a predetermined number or more of at least oneparticular symbol is arranged to the display as a result ofrearrangement of the plurality of symbols arranged to the display.

A playing method of a slot machine according to the fourth aspect of thepresent invention provides a playing method of a slot machine having thefollowing configuration.

That is, a playing method of a slot machine according to the fourthaspect of the present invention comprises the steps of: receiving aninput from a selection switch for selecting a symbol that is to be aparticular symbol, out of a plurality of symbols which are to bearranged to a display, determining the symbol corresponding to the inputfrom the selection switch as the particular symbol, determining a payoutranking of the particular symbol at random, and allotting a prize basedon the payout ranking, in an event that a predetermined number or moreof at least one particular symbol is arranged to the display as a resultof rearrangement of the plurality of symbols arranged to the display.

A playing method of a slot machine according to the fifth aspect of thepresent invention provides a playing method of a slot machine having thefollowing configuration.

That is, a playing method of a slot machine according to the fifthaspect of the present invention comprises the steps of: receiving aninput from a selection switch for selecting a symbol that is to be aparticular symbol out of a plurality of symbols which are to be arrangedto a display, determining the symbol corresponding to the input from theselection switch as the particular symbol, determining a payout rankingof the particular symbol at random, and allotting a prize based on thepayout ranking, in an event that a predetermined number or more of atleast one particular symbol is arranged to the display as a result ofrearrangement of the plurality of symbols arranged to the display.

A playing method of a slot machine according to the sixth aspect of thepresent invention provides a playing method of a slot machine having thefollowing configuration.

That is, a playing method of a slot machine according to the sixthaspect of the present invention comprises the steps of: counting thenumber of games, changing the number of symbols to be selected as theparticular symbol out of a plurality of symbols which are to be arrangedto a display, every time the number of games reaches a predeterminednumber, receiving an input from a selection switch for selecting asymbol that is to be a particular symbol, during a predetermined timeperiod provided on condition that the number of games has reached apredetermined number, determining the symbol corresponding to the inputfrom the selection switch as the particular symbol, upon receipt of theinput from the selection switch during the predetermined time period,determining at random the particular symbol out of the plurality ofsymbols, upon no receipt of the input from the selection switch duringthe predetermined time period, determining a payout ranking of theparticular symbol at random, and allotting a prize based on the payoutranking, in an event that a predetermined number or more of at least oneparticular symbol is arranged to the display as a result ofrearrangement of the plurality of symbols arranged to the display.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a view illustrating an exemplary image displayed when scattersymbols are determined;

FIG. 1B is a view illustrating another exemplary image displayed whenscatter symbols are determined;

FIG. 1C is a view illustrating still another exemplary image displayedwhen scatter symbols are determined;

FIG. 2A is a view illustrating an exemplary image displayed on a lowerimage display panel;

FIG. 2B is a view illustrating another exemplary image displayed on thelower image display panel;

FIG. 3 is a perspective view illustrating an external appearance of aslot machine according to an embodiment of the present invention;

FIG. 4 is a view illustrating symbols and code numbers of the respectivesymbols;

FIG. 5 is a block diagram illustrating an internal structure of the slotmachine illustrated in FIG. 3;

FIG. 6 is a view illustrating an exemplary payout ranking setting table;

FIG. 7 is a view illustrating an exemplary payout setting table;

FIG. 8 is a flow chart illustrating a subroutine of game executionprocessing;

FIG. 9 is a flow chart illustrating a subroutine of scatter-symbolselection processing;

FIG. 10 is a flow chart illustrating a subroutine of symboldetermination processing;

FIG. 11 is a view illustrating a relationship between combination prizesand the numbers of coins to be paid out; and

FIG. 12 is a flow chart illustrating a subroutine of bonus gameprocessing.

DESCRIPTION OF THE EMBODIMENTS

Each of FIGS. 1A to 1C is a view illustrating an exemplary image whichis displayed when scatter symbols are determined. FIGS. 2A and 2B areviews illustrating an exemplary image which is displayed on a lowerimage display panel. Although, the slot machine 10 is a standalone typeslot machine which is not connected to a network, the present inventioncan be applied to a slot machine connected to a network.

The lower image display panel 16 included in the slot machine 10according to the present invention is comprised of a liquid crystaldisplay panel, and displays fifteen display blocks 28 in five columnsand three rows as shown in FIGS. 2A and 2B. One symbol is arranged ineach display block 28. In the present embodiment, anyone of “CHERRY”,“BELL”, “STRAWBERRY”, “ORANGE”, “PLUM”, “BLUE7”, “JACKPOT7” and “APPLE”symbols is arranged in each display blocks 28.

Further, on the lower image display panel 16, there is formed onewinning line L that horizontally crosses the five display blocks 28displayed at the middle of the respective column (see FIG. 3). Thewinning line L defines a combination of symbols.

At the start of a game, namely when a spin button 23 is turned on andthe number of games reaches a predetermined number, an image illustratedin FIG. 1A is displayed on an upper image display panel 33. When thisimage is displayed, the player can select scatter symbols. The scattersymbols are symbols as follows. That is, when a predetermined number ormore of scatter symbols of the same type are arranged as a result ofrearrangement of symbols, this event causes a winning, and thereby theprize payout is conducted. In the present embodiment, there will bedescribed a case where a scatter prize will be allotted when three ormore scatter symbols are arranged. In the slot machine 10, one or moresymbols out of “CHERRY”, “BELL”, “STRAWBERRY”, “ORANGE” and “PLUM” maybecome scatter symbols. The player can input symbols that the playerchooses as scatter symbols. The scatter symbols correspond to particularsymbols in the present invention.

At a lower portion of the upper image display panel 33, there isdisplayed a number-of-selection image 201 depicting “Please select threesymbols”. Further, at a center portion thereof, there is displayed aselection image 200 for selecting symbols. The selection image 200 iscomprised of images indicating “CHERRY”, “BELL”, “STRAWBERRY”, “ORANGE”and “PLUM” in the mentioned order from the top. These images are imagesindicating symbols which can be selected. In the front surface of theupper image display panel 33, a touch panel 69 is provided. The playercan input symbols that the player chooses as scatter symbols, bytouching the portions of the selection image 200 corresponding to thesesymbols. The touch panel 69 corresponds to a selection switch accordingto the present invention.

For example, if “BELL”, “ORANGE” and “PLUM” are input, then an imageillustrated in FIG. 1B is displayed. In the selection image 200, thecolor of images indicating “BELL”, “ORANGE” and “PLUM” is turned red.Further, at a lower portion of the upper image display panel 33, thereis displayed an image depicting “The payout ranking is being set”.

The payout ranking refers to the ranking of the amounts of payoutassociated with symbols. More specifically, exemplifying therelationship between “BELL” and “CHERRY” in a case where the payoutranking of “BELL” is higher than the payout ranking of “CHERRY”, thepayout for “BELL” is greater than the payout for “CHERRY” when the samenumber of the symbols are displayed.

When the image illustrated in FIG. 1B is displayed, the slot machine 10determines, through random-number selection, the payout ranking of thethree symbols selected as scatter symbols.

When the payout ranking has been determined, an image illustrated inFIG. 1C, for example, is displayed. It is indicated in FIG. 1C that“ORANGE”, “PLUM” and “BELL” rank first, second and third, respectivelyin the payout ranking.

The payout ranking determined as described above is displayed at a rightportion of the lower image display panel 16 (see FIG. 2A). At this time,symbols are scrolled at the center portion of the lower image displaypanel 16.

Thereafter, after the scrolling of symbols, symbols are rearranged asillustrated in FIG. 2B, for example. In FIG. 2B, six “ORANGE” symbols,five “PLUM” symbols, two “CHERRY” symbols, one “BELL” symbol and one“APPLE” symbol have been rearranged. Accordingly, a scatter prizecorresponding to six “ORANGE” symbols and a scatter prize correspondingto five “PLUM” symbols are allotted. Namely, a scatter prizecorresponding to the six symbols ranked first in the payout ranking anda scatter prize corresponding to the five symbols ranked second in thepayout ranking are allotted.

Also, when five “JACKPOT7” symbols, five “BLUE7” symbols, five “BELL”symbols, five “CHERRY” symbols, five “STRAWBERRY” symbols, five “PLUM”symbols, five “ORANGE” symbols or five “APPLE” symbols are rearrangedalong the winning line L, then a predetermined number of coins are paidout. In the example illustrated in FIG. 2B, since the five “PLUM”symbols are rearranged along the winning line L, a prize correspondingto this combination is allotted (see FIG. 11).

While, in the aforementioned example, there has been described a casewhere both a scatter prize and a combination prize are allotted, in thepresent invention, it is also possible to grant that there is nocombination prize or it is possible to offer no combination prize incase of offering a scatter prize.

In the aforementioned example, there has been described a case wherethree symbols are selected as scatter symbols; however, in the presentinvention, one, two, four or more symbols can be selected or the numberof symbols to be selected as scatter symbols (the number of selections)can be changed each time at random. While, in the aforementionedexample, there has been described a case where scatter symbols areselected out of the five types of symbols “CHERRY”, “BELL”,“STRAWBERRY”, “ORANGE” and “PLUM”; however, in the present invention,the number of symbols from which the scatter symbols are selected may befour or less symbols or six or more symbols, or may be changed each timeat random. Also, in the present invention, the symbols which can beselected are not limited to “CHERRY”, “BELL”, “STRAWBERRY”, “ORANGE” and“PLUM”, and may be any symbols or may be changed each time at random.

In the aforementioned example, there has been described a case where theinput of selected symbols from the touch panel 69 is received when thenumber of games has reached a predetermined number; however, in thepresent invention, there is no particular limitation on the conditionrequired to enable reception of input of selected scatter symbols and,for example, input of selections can be received each time a game isstarted or on condition that a predetermined prize has been allotted orno prize has been allotted.

While, in the aforementioned example, there has been described a casewhere a scatter prize is allotted if three or more scatter symbols arearranged, in the present invention a scatter prize may be allotted whenone or more, two or more, or four or more scatter symbols are arranged.

While, in the aforementioned example, there has been described a casewhere symbols are selected as scatter symbols through the touch panel69, in the present invention the selection switch is not limited theretoand may be separately provided.

While there has been described a case where a total of 15 symbols aredisplayed along five columns and three rows in the aforementionedexample, the present invention is not limited to cases where symbols aredisplayed along five columns and three rows.

While, in the aforementioned example, there has been described a casewhere a total of 15 symbols are arranged along 5 columns and 3 rows, thepresent invention is not limited to use of 5 columns and 3 rows.Further, while, in the aforementioned example, there has been describeda case where symbols are displayed (arranged) on the lower image displaypanel 16 which is constituted by a liquid crystal display panel, thepresent invention is not limited thereto and, for example, mechanicalreels can be placed at the back surface of a display (for example, atransparent liquid crystal display panel), and symbols can be arrangedon the display using the mechanical reels. Further, while, in theaforementioned example, there has been described a case where symbolsare scrolled in the vertical direction along the respective columns, inthe present invention, respective symbols can be displayed individually.Further, in a case of employing the mechanical reels, it is possible toemploy the same number of mechanical reels as the number of symbols tobe arranged, thereby to enable scrolling respective symbolsindividually.

FIG. 3 is a perspective view illustrating an external appearance of aslot machine according to an embodiment of the present invention.

In the slot machine 10, a coin, a note or electronic valuableinformation corresponding thereto is used as a game media. In thepresent invention, however, the game media is not particularly limited,and for example, a medal, a token, an electronic money and a ticket canbe used. The ticket is not particularly limited and may include, forexample, a ticket with a bar code as described later, and of the liketickets.

The slot machine 10 includes: a cabinet 11; a top box 12 placed on theupper side of the cabinet 11; and a main door 13 provided at the frontface of the cabinet 11.

The lower side image display panel 16 as a display is provided at thefront of the main door 13. The lower image display panel 16 includes aliquid crystal panel which displays the 15 display blocks 28 along fivecolumns and three rows. Each display block 28 arranges a single symbol.

Further, on the lower image display panel 16, there is formed onewinning line L that horizontally crosses the five display blocks 28displayed at the middle of the respective column. The winning line Ldefines a combination of symbols.

In the lower image display panel 16, there are provided anumber-of-credits display section 31 and a number-of-payouts displaysection 32. The number-of-credits display section 31 displays an imageindicating the number of credited coins. The number-of-payouts displaysection 32 displays an image indicating the number of coin-out in anevent that a predetermined combination of symbols is arranged along thewinning line L (in an event of establishment of a combination prize) orin an event of establishment of a scatter prize.

Provided below the lower image display panel 16 are: a control panel 20constituting of a plurality of buttons, buttons 23 to 27, with whichcommands associated with progress of the game are input by the player; acoin receiving slot 21 accepting coins into the cabinet 11; and a billvalidator 22.

The control panel 20 is provided with: a spin button 23; a change button24; a CASHOUT button 25; a 1-BET button 26; and a maximum BET button 27.The spin button 23 is used for inputting a command to start thescrolling of symbols. The change button 24 is used in a case where aplayer requests an attendant of a recreation facility to exchange money.The CASHOUT button 25 is used for inputting a command to pay outcredited coins to a coin tray 18.

The 1-BET button 26 is used for inputting a command to bet one coin ofthe credited coins. The maximum BET button 27 is used for inputting acommand to bet the maximum number of coins that can be bet on one game(50 coins in the present embodiment) of the credited coins.

The bill validator 22 is used not only for discriminating a false notefrom a true note but also for accepting the true note into the cabinet11. The bill validator 22 may be configured such that a ticket 39 with abar code which will be described later can be read. A belly glass 34 onwhich characters and the like of the slot machine 10 are depicted isprovided on the front face of the lower portion of the main door 13,that is, below the control panel 20.

On a front surface of the top box 12, an upper image display panel 33 isprovided. The upper image display panel 33 includes a liquid crystaldisplay panel which displays, for example, images introducing thecontents of games and explaining the rules of games. Further, aselection image 200 for selecting symbols is displayed on the upperimage display panel 33.

Further, although not illustrated, the touch panel 69 is provided in thefront surface of the upper image display panel 33, allowing the playerto input various types of commands by operating the touch panel 69.

A speaker 29 is provided in the top box 12. A ticket printer 35, a cardreader 36, a data display 37 and a key pad 38 are provided beneath theupper image display panel 33. The ticket printer 35 prints on a ticket abar code in which data such as the number of credits, date, time,identification number of the slot machine 10 and of the like data areencoded, and outputs the ticket 39 with a bar code. A player can makethe ticket 39 with a bar code to be read by a second slot machine andplay a game in the second slot machine, or exchange in a predeterminedplace (for example, at a cashier in the casino) of a recreation facilitythe ticket 39 with a bar code to notes.

The card reader 36 is used for reading data from a smart card andwriting data onto a smart card. The smart card is a card to be carriedby a player, and for example, data to identify a player and dataconcerning a history of a game played by the player are stored thereon.Data corresponding to a coin, a note or a credit may also be stored onthe smart card. As an alternative of a smart card, a magnetic stripecard may be adopted. The data display 37 is a fluorescent display andthe like, and it is used, for example, to display data read by the cardreader 36 and data input by a player from the key pad 38. The key pad 38is used for inputting a command to issue a ticket and the like or data.

FIG. 4 is a view illustrating symbols and the code numbers of therespective symbols.

As illustrated in FIG. 4, a sequence of a total of 22 symbols havingcode numbers “00” to “21” are scrolled in each of the display blocks 28.Each symbol sequence is constituted by a combination of symbols of“JACKPOT7”, “BLUE7”, “BELL”, “CHERRY”, “STRAWBERRY”, “PLUM”, “ORANGE”and “APPLE”.

In an event that five “JACKPOT7” symbols, five “BLUE7” symbols, five“BELL” symbols, five “CHERRY” symbols, five “STRAWBERRY” symbols, five“PLUM” symbols, five “ORANGE” symbols or five “APPLE” symbols arerearranged along the winning line L (in an event of establishment of acombination prize), a predetermined number of coins are paid out (seeFIG. 11). Further, in an event that a predetermined number or more ofsymbols of the same type are rearranged (in an event of establishment ofa scatter prize), a predetermined number of coins are paid out (see FIG.7).

When the spin button 23 is pushed to start games, after the 1-BET button26 or the maximum-BET button 27 is pushed, symbols are displayed in sucha manner that they are scrolled in the up-to-down direction. After theelapse of a predetermined time period, the scrolled symbols arerearranged. When a prize is established at this time, a predeterminednumber of coins are paid out (see FIG. 7 and FIG. 11).

FIG. 5 is a block diagram showing the internal configuration of the slotmachine shown in FIG. 3. A gaming board 50 includes: CPU (CentralProcessing Unit) 51, ROM 55 and boot ROM 52 which are interconnected toone another by an internal bus; a card slot 53S which accepts a memorycard 53; and an IC socket 54S which accepts GAL (Generic Array Logic)54.

The memory card 53 is constituted of non-volatile memories such asCompactFlash® and stores a game program. The game program contains asymbol determination program. The symbol determination program is aprogram for determining symbols (code Nos. corresponding to the symbols)which are to be arranged along the winning line L.

The card slot 53S is configured so that the memory card 53 can beinserted therein or drawn out therefrom, and connected to a mother board40 through IDE bus. Therefore, a kind or contents of a game played inthe slot machine 10 can be changed by drawing out the memory card 53from the card slot 53S, writing a different game program thereon, andinserting the memory card 53 into the card slot 53S thereafter. The gameprogram includes a program related to progress in a game. The gameprogram further includes: image data and sound data that are outputwhile a game is played.

CPU 51, ROM 55 and boot ROM 52 interconnected to each other by theinternal bus are connected to the mother board 40 by PCI bus. The PCIbus not only conducts signal transmission between the mother board 40and the gaming board 50, but also supplies electric power to the gamingboard 50 from the mother board 40.

The mother board 40 is constructed with a general-purpose mother board(a printed circuit board on which basic parts of a personal computer aremounted) which is commercially available, and includes: a main CPU 41;ROM (Read Only Memory) 42; RAM (Random Access Memory) 43 and acommunication interface 44. The mother board 40 corresponds to thecontroller of the present invention.

ROM 42 is constituted of a memory device such as a flash memory andstores thereon a program such as BIOS (Basic Input/Output System)executed by the main CPU 41 and permanent data. When BIOS is executed bythe main CPU 41, not only is an initialization processing forpredetermined peripheral devices conducted, but a capture processing forthe game program stored on the memory card 53 is also started via thegaming board 50. In the present invention, contents of ROM 42 may berewritable or not rewritable.

RAM 43 stores data and a program used at the time of operation of themain CPU 41. RAM 43 can store the game program.

RAM 43 further stores data on the number of credits, the number ofcoin-in or coin-out for one game, and the like. Further, the RAM 43stores tables such as an payout ranking setting table, a payout settingtable and the like.

FIG. 6 is a view illustrating one example of a payout ranking settingtable.

This table has symbol fields, payout ranking fields and scatter-flagfields. In the symbol fields, five types of symbols “CHERRY”, “BELL”,“STRAWBERRY”, “ORANGE” and “PLUM” are stored. In the payout rankingfields, data indicating any of five ranks “A1” to “A5” of the payoutranking can be stored. Further, the payout ranking is set in ascendingorder from “A1” to “A5”.

Further, in the scatter-flag fields, there are stored any one of scatterflags “1” and “0”. The scatter flag “1” indicates that the symbol of thecorresponding row has been set to be a scatter symbol. On the otherhand, the scatter flag “0” indicates that the symbol of thecorresponding row has not been set to be a scatter symbol.

FIG. 7 illustrates an exemplary payout setting table.

This table has payout ranking fields and number-of-arranged-symbolsfields. The payout ranking fields are associated with the data in thepayout ranking fields in FIG. 6. Namely, in a case where “A1”, “A2”,“A3”, “A4” and “A5” are defined for “CHERRY”, “BELL”, “STRAWBERRY”,“ORANGE” and “PLUM”, respectively, this means that “CHERRY”, “BELL”,“STRAWBERRY”, “ORANGE”, “PLUM”, “BLUE7”, “JACKPOT7” and “APPLE” arestored in the payout ranking fields in FIG. 7.

The number-of-arranged-symbols fields are divided into fields of “three”arranged symbols, fields of “four” arranged symbols and fields of “fiveor more” arranged symbols. In the respective number-of-arranged-symbolsfields, there are stored numbers of coins to be paid out in associationwith the payout ranking. For example, when three “BLUE7” symbols arearranged, then 20 coins will be paid out. When four “BLUE7” symbols arearranged, then 40 coins will be paid out. Further, for example, when“A2” in the payout ranking is defined for “BELL” and, also, the scatterflag “1” is set for “BELL”, in a case where three “BELL” symbols arearranged, then four coins will be paid out.

Both a body PCB (Printed Circuit Board) 60 and a door PCB 80 which willbe described later are connected to the mother board 40 by USB. A powersupply unit 45 is also connected to the mother board 40.

Equipment and devices which generate input signals to be input to themain CPU 41, and equipment and devices of which operations arecontrolled by a control signal output from the main CPU 41 are connectedto the body PCB 60 and the door PCB 80. The main CPU 41 executes a gameprogram stored in RAM 43 based on the input signal input to the main CPU41, and thereby performs a predetermined computational processing tostore results thereof into RAM 43 and transmits a control signal to eachequipment and device as a control processing for each of the equipmentand devices.

A lamp 30, a hopper 66, a coin detecting section 67, a graphic board 68,a speaker 29, a touch panel 69, a bill validator 22, a ticket printer35, a card reader 36, a key switch 38S and a data display 37 areconnected to the body PCB 60. The lamp 30 is lit up in a predeterminedpattern based on a control signal output from the main CPU 41.

The hopper 66 is installed in the cabinet 11 and pays out apredetermined number of coins from a coin payout exit 19 to a coin-tray18 based on a control signal output from the main CPU 41. A coindetecting section 67 is installed inside the coin payout exit 19 and,when detecting that a predetermined number of coins has been paid outfrom the coin payout exit 19, outputs an input signal to the main CPU41.

The graphic board 68 controls, based on a control signal output from themain CPU 41, image displays on the upper image display panel 33 and thelower image display panel 16. In the respective display blocks 28 on thelower image display panel 16, symbols are displayed in a scrolling orrearranged manner. The number-of-credits display section 31 on the lowerimage display panel 16 displays the number of credits stored in the RAM43. Further, the number-of-payouts display section 32 on the lower imagedisplay panel 16 displays the number of coin-outs.

The graphic board 68 is equipped with VDP (Video Display Processor)which generates image data based on a control signal output from themain CPU 41 and a video RAM which temporarily stores image datagenerated by VDP, and the like. Note that image data used in generatingimage data with VDP is read from the memory card 53 and contained in agame program stored in RAM 43.

The bill validator 22 not only discriminates a true note from a falsenote, but also accepts the true note into the cabinet 11. The billvalidator 22, when accepting a true note, outputs an input signal to themain CPU 41 based on a face amount of the note. The main CPU 41 storesthe number of credits corresponding to the amount of the notetransmitted with the input signal.

The ticket printer 35, based on a control signal output from the mainCPU 41, prints on a ticket a bar code obtained by encoding data such asthe number of credits, date and time, the identification number of theslot machine 10, and of the like data stored in RAM 43, and outputs theticket 39 with a bar code.

The card reader 36 transmits to the main CPU 41 data read from the smartcard and writes data onto the smart card based on a control signal fromthe main CPU 41. The key switch 38S is provided on the keypad 38, andwhen the keypad 38 is operated by a player, outputs a predeterminedinput signal to the main CPU 41. The data display 37 displays, based ona control signal output from the main CPU 41, data read by the cardreader 36 and data input by a player through the key pad 38.

The control panel 20, a reverter 21S, a coin counter 21C and a coldcathode tube 81 are connected to the door PCB 80. The control panel 20is provided with a spin switch 23S corresponding to the spin button 23,a change switch 24S corresponding to the change button 24, a CASHOUTswitch 25S corresponding to the CASHOUT button 25, a 1-BET switch 26Scorresponding to the 1-BET button 26, and a maximum BET switch 27Scorresponding to the maximum BET button 27. When the buttons 23 to 27are operated by a player, each of the corresponding switches 23S to 27Soutputs input signals to the main CPU 41.

The coin counter 21C is installed inside the coin receiving slot 21, anddiscriminates whether a coin inserted by a player into the coinreceiving slot 21 is true or false. Coins other than the true ones aredischarged from the coin payout exit 19. The coin counter 21C alsooutputs an input signal to the main CPU 41 when a true coin is detected.

The reverter 21S operates based on a control signal output from the mainCPU 41 and distributes coins recognized by the coin counter 21C as truecoins into a cash box (not shown in the figure) or the hopper 66, whichare disposed in the slot machine 10. In other words, when the hopper 66is filled with coins, true coins are distributed into the cash box bythe reverter 21S. On the other hand, when the hopper 66 is not filledwith coins, true coins are distributed into the hopper 66. The coldcathode tube 81 works as a backlight installed on the back face sides ofthe lower image display panel 16 and the upper image display panel 33and is lit up based on a control signal output from the main CPU 41.

Next, description will be given of a processing performed in the slotmachine 10.

The main CPU 41 reads and executes the game program so that a game isprogressed.

FIG. 8 is a flowchart showing a subroutine of a game executionprocessing.

In the game execution processing, the main CPU 41 at first determineswhether or not a coin is BET (step S10). In the processing, the main CPU41 determines whether an input signal output from the 1-BET switch 26Sor the maximum BET switch 27S has been received or not when the 1-BETbutton 26 or the maximum BET button 27 is operated, respectively. Whenit is determined that a coin has not been BET, the process returns tostep S10.

On the other hand, when it is determined in step S10 that a coin hasbeen BET, the main CPU 41 conducts a processing for subtracting thenumber of credits stored in RAM 43 according to the number of BET coins(step S11). In a case where the number of BET coins is more than thenumber of credits stored in RAM 43, the process returns to step S10without conducting subtraction from the number of credits stored in RAM43. In a case where the number of BET coins exceeds the upper limit (50coins in the present embodiment) up to which a BET is possible in onegame, the process advances to step S12 without conducting a processingfor subtracting the number of BET coins from the number of creditsstored in RAM 43.

The main CPU 41 determines in step S12 whether the spin button 23 hasbeen turned ON or not. In the processing, the main CPU 41 determines,when the spin button 23 is pressed, whether an input signal output fromthe spin switch 23S has been received or not.

When it is determined that the spin button 23 has not been turned ON,the process returns to step S10. Here, in a case where the spin buttonhas not been turned ON (for example, in a case where a command ofterminating a game has been input without turning ON the spin button23), the main CPU 41 cancels a result of the subtracting processing instep S11.

On the other hand, if the main CPU 41 determines, at the step S12, thatthe spin button 23 has been pressed, the main. CPU 41 conductsscatter-symbol selection processing (step S13). Scatter-symboldetermination processing will be described in detail later withreference to FIG. 9.

Next, the main CPU 41 conducts symbol determination processing (stepS14) In the symbol determination-processing, the main CPU 41 executes asymbol determination program stored in the RAM 43 to determine the codeNos. at the time of stopping of symbols. This processing will bedescribed in detail later with reference to FIGS. 10 and 11. Further, inthe present embodiment, there will be described a case where the symbolsto be rearranged are determined to determine one or more prizes from aplurality types of prizes. However, in the present invention, forexample, one or more prizes to be selected can be determined out of theplurality types of prizes and, thereafter, a combination of symbols tobe rearranged can be determined based on the aforementioned prize.

Next, at step S15, the main CPU 41 conducts scroll-display controlprocessing. This processing is a processing for controlling the displaysuch that the symbols determined at the step S14 are rearranged afterthe start of scrolling of symbols.

Next, the main CPU 41 determines whether or not a bonus game trigger hasbeen established, namely whether or not “APPLE” symbols have beenstop-displayed along the winning line L (step S16). When the main CPU 41determines that a bonus game trigger has been established, then the mainCPU 41 reads, from the RAM 43, a program for executing a bonus game andexecutes bonus game processing (step S17) and ends the presentsubroutine. The bonus game processing will be described in detail laterwith reference to FIG. 12.

When the main CPU 41 determines that no bonus game trigger has beenestablished at step S16, the main CPU 41 determines whether or not acombination prize has been established (step S20). When the main CPU 41determines that a combination prize has been established, the main CPU41 stores, in the RAM 43, a number of coins to be paid out whichcorresponds to the number of inserted coins and the combination prize(see FIG. 11) (step S21).

When no combination prize has been established (step S20: NO) or afterthe processing at the step S21, the main CPU 41 determines whether ornot a scatter prize has been established (step S22). When the main CPU41 determines that a scatter prize has been established, the main CPU 41stores, in the RAM 43, a number of coins to be paid out whichcorresponds to the number of inserted coins and the scatter prize (seeFIG. 7) (step S23).

If it is determined, at the step S22, that no scatter prize has beenestablished, or after the processing at the step S25, the main CPU 41sums the numbers of coins to be paid out stored in the RAM 43, then paysout a number of coins which corresponds to the resultant sum (step S24)and ends the present subroutine.

FIG. 9 is a flow chart illustrating the subroutine of scatter-symbolselection processing.

First, the main CPU 41 counts up the number of games, based on inputsignals which are output from the spin switch 23S when the spin button23 is pressed (step S80).

Next, at a step S81, the main CPU 41 determines whether or not thenumber of games has reached a predetermined number. When the main CPU 41determines that the number of games has not reached the predeterminednumber, then it ends the present subroutine. On the other hand, when themain CPU 41 determines that the number of games has reached thepredetermined number, then it determines the number of symbols to bedisplayed (step S82).

Next, at a step S83, the main CPU 41 determines symbols which can beselected, the number of which corresponds to the number of symbols to bedisplayed. Accordingly, for example, as illustrated in FIG. 1A, fivesymbols which can be selected are displayed on the upper image displaypanel 33.

Next, at a step S84, the main CPU 41 determines the number of symbols tobe selected. Accordingly, for example, as illustrated in FIG. 1A, anumber-of-selections image 201 indicating that three symbols should beselected out of the symbols which can be selected is displayed on theupper image display panel 33, and that selections of such three symbolsare received.

Next, at a step S85, the main CPU 41 displays, on the upper imagedisplay panel 33, an image based on the number of symbols to bedisplayed, the symbols which can be selected and the number of symbolsto be selected, which have been determined (see FIG. 1A).

Next, at a step S86, the main CPU 41 determines whether or not symbolshave been selected. In this processing, the main CPU 41 determineswhether or not it has received symbol selection signals from the touchpanel 69 output through player's operations. When the main CPU 41determines that no symbol has been selected, then the main CPU 41determines whether or not an allowed selection time period has elapsed(step S87). When the main CPU 41 determines that the allowed selectiontime period has not elapsed, then the main CPU 41 returns the process tothe step S86. On the other hand, when the main CPU 41 determines thatthe allowed selection time period has elapsed, then the main CPU 41selects symbols at random (step S88).

When symbols have been selected at the step S86 or after the processingat the step S88, the main CPU 41 stores, in the RAM 43, the selectedsymbols as scatter symbols. More specifically, the main CPU 41 sets thescatter flags for the selected symbols to “1”, in the payout rankingsetting table illustrated in FIG. 6.

Next, at the step S90, the main CPU 41 displays the selected symbols asscatter symbols, on the upper image display panel 33 (see FIG. 1B).

Next, at a step S91, the main CPU 41 determines whether or not all theselections have been completed. If all the selections have not beencompleted, then the main CPU 41 returns the process to the step S86.

When all the selections have been completed at the step S91, the mainCPU 41 determines the payout ranking of the selected symbols, at random,through random-number selection (step S92). The determined payoutranking is stored in the RAM 43. More specifically, any of “A1” to “A5”are stored in the payout ranking fields in the payout ranking settingtable illustrated in FIG. 6.

Next, at a step S93, the main CPU 41 clears the count value of thenumber of games and ends the present subroutine.

FIG. 10 is a flowchart showing a subroutine of a symbol determinationprocessing called and executed in step S14 of the subroutine shown inFIG. 8. The processing is a processing conducted by executing a symboldetermination program stored in RAM 43 with the main CPU 41.

The main CPU 41 executes a random number generating program included inthe symbol determination program, and a random number value from thenumerical value range of 0 to 255 is selected thereby such that each ofthe selected random number values correspond to each of the symbolsequences (step S31). In the present embodiment, description will begiven of a case where random numbers are generated on a program (a casewhere so-called software random numbers are used). In the presentinvention, however, a random number generator may be used, and randomnumbers may be extracted therefrom (so-called hardware random numbersmay be used).

Then, the main CPU 41 determines, based on the selected five randomnumber values, code Nos. (see FIG. 4) for each of the symbol sequences(step S32). The code Nos. of the symbol sequences correspond to codeNos. of the symbols stop displayed along the winning line L. The mainCPU 41 determines code Nos. of the symbol sequences to thereby determinea prize. For example, in a case where code Nos. of the symbol sequencesare determined “00”, “00”, “00”, “00” and “00”, it means that the mainCPU 41 determined a prize as “JACKPOT 7”.

Further, in the present embodiment, respective symbols are scrolledindividually, while rearrangement is performed based on the symbol rows.Namely, for example, when a code No. of “10” is set for a single symbolrow, then the symbols having code Nos. of “9”, “10” and “11” will befinally arranged on the lower image display panel 16, while respectivesymbols are scrolled individually during scrolling thereof.

Hereinafter, there will be described combination prizes according to thepresent embodiment.

FIG. 11 is a view illustrating the relationship between a pluralitytypes of combination prizes and numbers of coins to be paid out.

If five “APPLE” symbols are arranged along the winning line L and, thus,winning of a bonus game trigger occurs, this causes a bonus game. In abonus game, a free game is executed a predetermined number of times,based on random numbers resulted from the execution of a random-numbergeneration program included in the symbol determination program.

Also, when five “JACKPOT7” symbols are arranged along the winning lineL, then 30 coins are paid out per single inserted coin. Similarly, iffive “BLUE7” symbols, five “BELL” symbols, five “STRAWBERRY” symbols,five “PLUM” symbols, five “CHERRY” symbols or five “ORANGE” symbols arearranged along the winning line L, a number of coins which correspondsto the corresponding one of the respective combination prizes are paidout.

FIG. 12 is a flowchart showing a subroutine of a bonus game processingcalled and executed in step S17 of the subroutine shown in FIG. 8. Inthe bonus game processing, firstly, the main CPU 41 determines a numberT of bonus games from 10 to 25 games, based on a random number valueobtained by executing a random number generation program included in asymbol determination program stored in RAM 43 (step S60). The main CPU41 stores as data into RAM 43 the number of games of the determinedbonus games.

Subsequently, the main CPU 41 conducts scatter-symbol selectionprocessing (step S61), symbol determination processing (step S62), andscroll-display control processing (step S63). The processing at thesteps S61 to S63 is substantially the same as the processing describedwith reference to FIG. 8. This processing has been already described anddescription thereof is omitted herein.

Next, the main CPU 41 determines whether or not a bonus game trigger hasbeen established, namely whether or not “APPLE” symbols have beenstop-displayed along the winning line L (step S64). When it isdetermined that the bonus game trigger has been established, the numbert of additional games of the bonus game is determined (step S65) and thedetermined number t of additional games is added to the number T ofgames of the bonus game at that time (step S66). Thus, when a bonus gameis hit during the bonus game, a remaining number of bonus gamesincreases. More specifically, for example, in a case where a gamingstate shifts to 20 bonus games for the first time, and hits 17 bonusgames upon conducting a twelfth game 12 of the bonus games, another 25bonus games (20 bonus games−12 bonus games+17 bonus games) are to beconducted.

If no bonus game trigger has been established at the step S64, the mainCPU 41 determines whether or not a combination prize has beenestablished (step S71). The processing at the steps S71 to S75 issubstantially the same as the processing at the steps S20 to S24 whichhas been already described, and description thereof is omitted herein.

When the processing at the step S66 has been executed, or when theprocessing at the step S75 has been executed, the main CPU 41 reads outthe number of bonus games T stored in the RAM 43 and subtracts, by one,the number T of bonus games read out therefrom. Then, the main CPU 41stores the subtracted number T of games in the RAM 43, again (step S69).

Then, the main CPU 41 determines whether the number T of bonus gamesreaches the number of games determined in step S60 or not (step S70).More specifically, the determination is made based on whether or not thenumber T of games stored in RAM 43 has become 0, and if the number T ofgames is not 0, that is, when it is determined that the number of bonusgames played does not reach the number of games which were determined instep S60, the process returns to step S61, and the above-mentionedprocessing is repeated. On the other hand, when the number T of games is0, that is, when it is determined that the number T of games has reachedthe number of games which were determined in step S60, the presentsubroutine is completed thereafter.

As described above, according to the slot machine 10 and the playingmethod thereof of the present embodiment, the number of games is countedand, every time the number of games reaches a predetermined number, thenumber of symbols to be selected as scatter symbols (particular symbols)is changed, and inputs from the touch panel 69 (the selection switch)are received during the allowed selection time period (a predeterminedtime period) provided on condition that the number of games has reachedthe predetermined number. Then, when there are inputs from the touchpanel 69 during the allowed selection time period, symbols correspondingto the inputs are determined to be scatter symbols. When there is noinput from the touch panel 69 during the allowed selection time period,symbols are selected from a plurality of symbols at random and theselected symbols are determined to be scatter symbols. Thereafter, thepayout ranking of the scatter symbols is determined at random. Further,if three (a predetermined number) or more scatter symbols of any typeare arranged on the lower image display panel 16 as a result ofrearrangement of the plurality of symbols arranged on the lower imagedisplay panel 16 (display), then a prize based on the aforementionedpayout ranking will be allotted.

Although the embodiments according to the present invention aredescribed in the above, the descriptions present only some of thespecific examples, and are not intended to limit the present inventionin any way and specific constitutions of each means and the like can beproperly changed in terms of design. Besides, the effects described inthe embodiments of the present invention are only the most preferableeffects generated from the present invention and effects to be caused bythe present invention is not limited to those described in theembodiments of the present invention.

In the above detailed description, for a better and easier understandingof the present invention, the description is mainly made on thefeaturing aspects of the present invention. The present invention is notlimited to the embodiments in the above detailed description, and may beapplied to other varieties of embodiments. Also, it is to be understoodthat the phraseology and terminology employed in this specification areused to precisely describe the present invention, and should not beregarded as limiting the interpretation of the present invention.Moreover, based on the conception described in the presentspecification, those skilled in the art will readily come up with otherconfiguration, systems and methods and the like included in theconception of the present invention. As such, it should be elucidatedthat the claims include such equivalent constitutions insofar as they donot depart from the spirit and scope of the present invention. Further,the purpose of the foregoing abstract is to enable the U.S. Patent andTrademark Office and general public institutions, and those skilled inthe art and the like who are not familiar with patent or legalterminology, to quickly determine the nature and essence of thetechnical disclosure of this application with a simple search.Therefore, the abstract is not intended to define the scope of thepresent invention, which should be measured by the description of theclaims. Furthermore, for fully understanding the purposes and thefeaturing effects of the present invention, desirably, the presentinvention is interpreted with reference to published publications andthe like.

The detailed descriptions aforementioned may be presented in terms ofprocessing executed by a computer. Those descriptions and terms setforth in the above are described for the purpose that those skilled inthe art understand the present invention in a most effective way. In thepresent specification, each step used for leading one result should beunderstood a self-consistent procedure. In each step, sending andreceiving, or recording or the like of electrical or magnetic signalsare performed. Although, such signals are expressed in bit, value,symbol, character, term, number and the like in processing of each step;however, it is important to note that those expressions are used simplyfor convenience of explanation. Moreover, processing in each step is insome cases described using expressions in common with those for humanactivities, but processing described in the present specification is inprinciple performed by various apparatuses. Furthermore, some otherconstitutions required for carrying out the respective step areconsidered to be self-explanatory from the aforementioned descriptions.

1. A slot machine comprising: a display to which a plurality of symbolsare arranged; a selection switch for selecting a symbol that is to be aparticular symbol, out of said plurality of symbols; and a controller,said controller determining the symbol corresponding to an input fromsaid selection switch as the particular symbol, determining a payoutranking of the particular symbol at random, and allotting a prize basedon said payout ranking, in an event that a predetermined number or moreof at least one particular symbol is arranged to said display as aresult of rearrangement of the plurality of symbols arranged to saiddisplay.
 2. The slot machine according to claim 1, wherein saidcontroller further comprises counting the number of games, and receivingan input from said selection switch on condition that the number ofgames has reached a predetermined number.
 3. The slot machine accordingto claim 2, wherein said controller further comprises receiving an inputfrom said selection switch during a predetermined time period providedon condition that the number of games has reached a predeterminednumber, determining the symbol corresponding to the input from saidselection switch as the particular symbol, upon receipt of the inputfrom said selection switch during said predetermined time period, anddetermining at random the particular symbol out of the plurality ofsymbols, upon no receipt of the input from said selection switch duringsaid predetermined time period.
 4. The slot machine according to claim1, wherein said controller further comprises changing the number ofsymbols to be selected as the particular symbol on condition that apredetermined condition is satisfied.
 5. The slot machine according toclaim 4, wherein said controller further comprises counting the numberof games, and changing the number of symbols to be selected as theparticular symbol, every time the number of games reaches apredetermined number.
 6. A slot machine comprising: a display to which aplurality of symbols are arranged; a selection switch for selecting asymbol that is to be a particular symbol, out of said plurality ofsymbols; and a controller, said controller counting the number of games,receiving the input from said selection switch during a predeterminedtime period provided on condition that the number of games has reached apredetermined number, determining the symbol corresponding to the inputfrom said selection switch as the particular symbol, upon receipt of theinput from said selection switch during said predetermined time period,determining at random the particular symbol out of the plurality ofsymbols, upon no receipt of the input from said selection switch duringsaid predetermined time period, determining a payout ranking of theparticular symbol at random, and allotting a prize based on said payoutranking, in an event that a predetermined number or more of at least oneparticular symbol is arranged to said display as a result ofrearrangement of the plurality of symbols arranged to said display. 7.The slot machine according to claim 6, wherein said controller furthercomprises changing the number of symbols to be selected as theparticular symbol on condition that a predetermined condition issatisfied.
 8. The slot machine according to claim 7, wherein saidcontroller further comprises changing the number of symbols to beselected as the particular symbol, every time the number of gamesreaches a predetermined number.
 9. A slot machine comprising: a displayto which a plurality of symbols are arranged; a selection switch forselecting a symbol that is to be a particular symbol, out of saidplurality of symbols; and a controller, said controller counting thenumber of games, changing the number of symbols to be selected as theparticular symbol every time the number of games reaches a predeterminednumber, receiving an input from said selection switch during apredetermined time period provided on condition that the number of gameshas reached a predetermined number, determining the symbol correspondingto the input from said selection switch as the particular symbol, uponreceipt of the input from said selection switch during saidpredetermined time period, determining at random the particular symbolout of the plurality of symbols, upon no receipt of the input from saidselection switch during said predetermined time period, determining apayout ranking of the particular symbol at random, and allotting a prizebased on said payout ranking, in an event that a predetermined number ormore of at least one particular symbol is arranged to said display as aresult of rearrangement of the plurality of symbols arranged to saiddisplay.
 10. A playing method of a slot machine comprising the steps of:receiving an input from a selection switch for selecting a symbol thatis to be a particular symbol, out of a plurality of symbols which are tobe arranged to a display, determining the symbol corresponding to theinput from said selection switch as the particular symbol, determining apayout ranking of the particular symbol at random, and allotting a prizebased on said payout ranking, in an event that a predetermined number ormore of at least one particular symbol is arranged to said display as aresult of rearrangement of the plurality of symbols arranged to saiddisplay.
 11. The playing method of a slot machine according to claim 10,further comprising the steps of counting the number of games, andreceiving the input from said selection switch in said step of receivingthe input on condition that the number of games has reached apredetermined number.
 12. The playing method of a slot machine accordingto claim 11, further comprising the steps of determining at random theparticular symbol out of the plurality of symbols, upon no receipt ofinput from said selection switch, receiving the input from saidselection switch in said step of receiving the input, during apredetermined time period provided on condition that the number of gameshas reached a predetermined number, and determining at random theparticular symbol out of the plurality of symbols in said step ofdetermining the particular symbol at random, upon no receipt of theinput from said selection switch during a time period.
 13. The playingmethod of a slot machine according to claim 10, further comprising astep of changing the number of symbols to be selected as the particularsymbol on condition that a predetermined condition is satisfied.
 14. Theplaying method of a slot machine according to claim 13, furthercomprising the steps of counting the number of games, and changing thenumber of symbols to be selected as the particular symbol in said stepof changing, every time the number of games reaches a predeterminednumber.
 15. A playing method of a slot machine comprising the steps of:counting the number of games, receiving an input from a selection switchfor selecting a symbol that is to be a particular symbol out of aplurality of symbols which are to be arranged to a display, during apredetermined time period provided on condition that the number of gameshas reached a predetermined number, determining the symbol correspondingto the input from said selection switch as the particular symbol, uponreceipt of the input from said selection switch during saidpredetermined time period, determining at random the particular symbolout of the plurality of symbols, upon no receipt of the input from saidselection switch during said predetermined time period, determining apayout ranking of the particular symbols at random, and allotting aprize based on said payout ranking, in an event that a predeterminednumber or more of at least one particular symbol is arranged to saiddisplay as a result of rearrangement of the plurality of symbolsarranged to said display.
 16. The playing method of a slot machineaccording to claim 15, further comprising a step of changing the numberof symbols to be selected as the particular symbol on condition that apredetermined condition is satisfied.
 17. The playing method of a slotmachine according to claim 16, further comprising a step of changing thenumber of symbols to be selected as the particular symbol in said stepof changing, every time the number of games reaches a predeterminednumber.
 18. A playing method of a slot machine comprising the steps of:counting the number of games, changing the number of symbols to beselected as the particular symbol out of a plurality of symbols whichare to be arranged to a display, every time the number of games reachesa predetermined number, receiving an input from a selection switch forselecting a symbol that is to be a particular symbol, during apredetermined time period provided on condition that the number of gameshas reached a predetermined number, determining the symbol correspondingto the input from said selection switch as the particular symbol, uponreceipt of the input from said selection switch during saidpredetermined time period, determining at random the particular symbolout of the plurality of symbols, upon no receipt of the input from saidselection switch during the predetermined time period, determining apayout ranking of the particular symbol at random, and allotting a prizebased on said payout ranking, in an event that a predetermined number ormore of at least one particular symbol is arranged to said display as aresult of rearrangement of the plurality of symbols arranged to saiddisplay.